This reconstruction of a Viking farm sits on the banks of the Göta River in Ale, a few miles north of Gothenburg, Sweden. This oak home is based on Viking evidence, from Lake Tissö in Denmark. The home is 16.5m (54ft) long and 7m (23ft) wide with an oak shingle roof and Celtic knot carvings based on designs from the mid 10th Century, the mathematics of which are complex www.en.wikipedia.org/wiki/Knot_theory. You can read more here: www.vastsverige.com/en/Ale/articles/Ale-Vikingagard/